OFS Laboratories, Somerset, New Jersey 08873, USA.
Opt Lett. 2013 Jul 15;38(14):2538-41. doi: 10.1364/OL.38.002538.
High-power fiber lasers operating at the 1.5 μm wavelength region have attractive features, such as eye safety and atmospheric transparency, and cascaded Raman fiber lasers offer a convenient method to obtain high-power sources at these wavelengths. A limitation to power scaling, however, has been the lower conversion efficiency of these lasers. We recently introduced a high-efficiency architecture for high-power cascaded Raman fiber lasers applicable for 1.5 μm fiber lasers. Here we demonstrate further power scaling using this new architecture. Using numerical simulations, we identify the ideal operating conditions for the new architecture. We demonstrate a high-efficiency 1480 nm cascaded Raman fiber laser with an output power of 301 W, comparable to record power levels achieved with rare-earth-doped fiber lasers in the 1.5 μm wavelength region.
高功率光纤激光器在 1.5μm 波长区域运行时具有吸引力，例如眼部安全性和大气透明度，级联拉曼光纤激光器提供了一种在这些波长下获得高功率源的便捷方法。然而，功率扩展的限制是这些激光器的转换效率较低。我们最近引入了一种适用于 1.5μm 光纤激光器的高效率高功率级联拉曼光纤激光器架构。在这里，我们使用这种新架构进一步进行了功率扩展。使用数值模拟，我们确定了新架构的理想工作条件。我们展示了一种高效率的 1480nm 级联拉曼光纤激光器，输出功率为 301W，与在 1.5μm 波长区域实现的掺稀土光纤激光器的记录功率水平相当。
